function ajax(ops={}){
    let {type="get", success, error, url, data={}, timeout=100} = ops;
    let str = "";
    for(let i in data){
        str += `${i}=${data[i]}&`;
    }
    url = type==="get" ? url+"?"+str.slice(0,-1) : url;
    const xhr = new XMLHttpRequest();
    xhr.timeout = timeout;
    xhr.open(type, url, true);
    xhr.onload = function(){
        if(xhr.status === 200){
            if(success) success(xhr.responseText);
        }else{
            if(error) error(xhr.status);
        }
    }
    xhr.ontimeout = function(){
        if(error) error("timeout");
        xhr.abort();
    }
    if(type === "post"){
        xhr.setRequestHeader( "Content-type", "application/x-www-form-urlencoded" );
        xhr.send( str.slice(0,-1) );
    }else{
        xhr.send();
    }
}